#define TRIG_PIN 3
#define ECHO_PIN 4

void setup() {
  Serial.begin(9600);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  long duration, distance;

  // Clear the TRIG_PIN
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);

  // Send a pulse to TRIG_PIN
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Measure the duration of the pulse received on ECHO_PIN
  duration = pulseIn(ECHO_PIN, HIGH);

  // Convert the duration into distance
  distance = (duration * 0.0343) / 2;

  // Print the distance to Serial Monitor
  Serial.print(distance);
  Serial.println();

  delay(1000); // Wait for a second before taking the next measurement
}